guy's when you use this is there any thing different you need to do to prep the cylinders for clearance after filling has set up. I'm thinking of filling a block that is 4.450 now so it can be opened up to a 4.470 bore for a new piston deal.

Don't know if it can be opened up that much, but putting block filler in it shouldn't keep it from being done. Also when I was cleaning my shop I found two bottles of Block filler under my work bench .. Will sell it half price plus shipping ..